She is tall and has green eyes with backward question mark ( ⸮ ) irises, red glasses, and short brown hair with a few blonde streaks. She wears a dark green sweater on top of a white, collared shirt with a red ribbon. She is described by many including Suisei Nanamura as having very powerful legs. Yui's strongest trait is that she has a strong sense of justice and believes that detectives should always be people that fight towards such justice.